Hi,
you work out the type of data you wish to store in it and how much of that data you need to store and you create an array that is big enough to hold it. If you don't know how big the data is, you can initialise a generic list and then use the ToArray() method on the list to convert to tyhe array of the type you want.
Eample on each type below.
int[] arr = new int[size];
List<int> lst = new List<int>();
int[] = lst.ToArray();
</int></int>
Dave